mirror of
https://github.com/ovh/debian-cis.git
synced 2025-08-31 11:54:07 +02:00
4be1a9d9e4
- iptables_loopback.sh -> 4.3.2.2 - iptables_rule_them_all.sh -> 4.3.2.4 - iptables_outbound_established.sh -> 4.3.2.3 - ip6tables_loopback.sh -> 4.3.3.2 - ip6tables_outbound_established.sh -> 4.3.3.3 - ip6tables_rule_them_all.sh -> 4.3.3.4 - ip6tables_default_deny_policy.sh -> 4.3.3.1
115 lines
3.1 KiB
Bash
Executable File
115 lines
3.1 KiB
Bash
Executable File
#!/bin/bash
|
|
|
|
# run-shellcheck
|
|
#
|
|
# CIS Debian Hardening
|
|
#
|
|
|
|
#
|
|
# Ensure ip6tables loopback traffic is configured (Automated)
|
|
#
|
|
|
|
set -e # One error, it's over
|
|
set -u # One variable unset, it's over
|
|
|
|
# shellcheck disable=2034
|
|
HARDENING_LEVEL=2
|
|
# shellcheck disable=2034
|
|
DESCRIPTION="Ensure ip6tables loopback traffic is configured"
|
|
PACKAGE="iptables"
|
|
|
|
# This function will be called if the script status is on enabled / audit mode
|
|
audit() {
|
|
is_pkg_installed "$PACKAGE"
|
|
if [ "$FNRET" -ne 0 ]; then
|
|
crit "$PACKAGE is not installed"
|
|
return
|
|
fi
|
|
|
|
is_ipv6_enabled
|
|
if [ "$NFRET" -ne 0 ]; then
|
|
ok "ipv6 is not enabled"
|
|
return
|
|
fi
|
|
|
|
IPTABLES_LOOPBACK_INPUT=1
|
|
IPTABLES_LOOPBACK_OUTPUT=1
|
|
IPTABLES_LOOPBACK_DENY=1
|
|
|
|
local input_rules
|
|
local output_rules
|
|
input_rules=$($SUDO_CMD ip6tables -S INPUT 2>/dev/null)
|
|
output_rules=$($SUDO_CMD ip6tables -S OUTPUT 2>/dev/null)
|
|
|
|
# the '.*' below is in case of comments
|
|
# shellcheck disable=2086
|
|
if grep "\-A INPUT -i lo.*-j ACCEPT" <<<$input_rules >/dev/null; then
|
|
ok "loopback is configured in ip6tables input rules"
|
|
IPTABLES_LOOPBACK_INPUT=0
|
|
else
|
|
crit "loopback is not configured in ip6tables input rules"
|
|
fi
|
|
|
|
# shellcheck disable=2086
|
|
if grep "\-A INPUT -s ::1 .*-j DROP" <<<$input_rules >/dev/null; then
|
|
ok "::1 is dropped in ip6tables input rules"
|
|
IPTABLES_LOOPBACK_DENY=0
|
|
else
|
|
crit "::1 is not dropped in ip6tables input rules"
|
|
fi
|
|
|
|
# shellcheck disable=2086
|
|
if grep "\-A OUTPUT -o lo.*-j ACCEPT" <<<$output_rules >/dev/null; then
|
|
ok "loopback is configured in ip6tables output rules"
|
|
IPTABLES_LOOPBACK_OUTPUT=0
|
|
else
|
|
crit "loopback is not configured in ip6tables output rules"
|
|
fi
|
|
|
|
}
|
|
|
|
# This function will be called if the script status is on enabled mode
|
|
apply() {
|
|
audit
|
|
if [ "$IPTABLES_LOOPBACK_INPUT" -ne 0 ]; then
|
|
info "update ip6tables rules to allow loopback input"
|
|
ip6tables -A INPUT -i lo -j ACCEPT
|
|
fi
|
|
|
|
if [ "$IPTABLES_LOOPBACK_OUTPUT" -ne 0 ]; then
|
|
info "update ip6tables rules to allow loopback" output
|
|
ip6tables -A OUTPUT -o lo -j ACCEPT
|
|
fi
|
|
|
|
if [ "$IPTABLES_LOOPBACK_DENY" -ne 0 ]; then
|
|
info "update ip6tables rules to drop ::1 input"
|
|
ip6tables -A INPUT -s ::1 -j DROP
|
|
fi
|
|
}
|
|
|
|
# This function will check config parameters required
|
|
check_config() {
|
|
:
|
|
}
|
|
|
|
# Source Root Dir Parameter
|
|
if [ -r /etc/default/cis-hardening ]; then
|
|
# shellcheck source=../../debian/default
|
|
. /etc/default/cis-hardening
|
|
fi
|
|
|
|
if [ -z "$CIS_LIB_DIR" ]; then
|
|
echo "There is no /etc/default/cis-hardening file nor cis-hardening directory in current environment."
|
|
echo "Cannot source CIS_LIB_DIR variable, aborting."
|
|
exit 128
|
|
fi
|
|
|
|
# Main function, will call the proper functions given the configuration (audit, enabled, disabled)
|
|
if [ -r "${CIS_LIB_DIR}"/main.sh ]; then
|
|
# shellcheck source=../../lib/main.sh
|
|
. "${CIS_LIB_DIR}"/main.sh
|
|
else
|
|
echo "Cannot find main.sh, have you correctly defined your root directory? Current value is $CIS_LIB_DIR in /etc/default/cis-hardening"
|
|
exit 128
|
|
fi
|